Page 54 - Modern Steel Construction (April 2019)

Fig. 7. Determining a load path
via two different methods.

(a) Design by parallel force method (b) Design by uniform force method

7. Load paths have consequences. The essence of connec- building using both methods. Which do you think is the more
tion design (and all design) is the determination of a statically economical of the two?
admissible load path. The uniform force method (UFM) and the 8. Engage the erector as soon as possible. Engage the erec-
parallel force method (PFM) both provide statically admissible tor, preferably before detailing and connection design begins, in
load paths for bracing connections, as shown in AISC Design order to understand their bolting and welding preferences/pro-
Guide 29: Vertical Bracing Connections—Analysis and Design. These cedures, as well as the overall erection plan, sequencing and any
methods both produce safe and acceptable designs, but not the special requirements—cranes, logistics, etc. Connection designs,
same design. Figure 7 shows designs for the same location in a detailing and fabrication need to meet these requirements.

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6 Press Brakes
1000 Ton x 30’ 750 Ton x 24’
400 Ton x 23’ 3-225 Ton x (10’, 12’, 14’)
CNC Machining

Quality
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54 | APRIL 2019